JoongHo Ahn

Cohesion and coupling metrics for ontology modules

In recent years, an increasing number of ontologies and semantic web applications have been developed and used. A conscious effort has been made to develop methods to modularize ontologies. These methods contribute to building a new ontology. However, few studies have focused on the evaluative methods for ontology modules. In this study, we propose novel metrics to measure ontology modularity. To evaluate the ontology modules, we introduce cohesion and coupling based on the theory of software metrics. A cohesion metric and two coupling metrics were used to measure cohesion and coupling for ontology modules. The proposed metrics provide more detailed support in considering the different types of relationships between classes in ontology modules. In addition, the new coupling metrics contribute to checking the consistency between the ontology modules and their original ontology. The proposed metrics were validated using well-known verification frameworks and empirical experiments to complement the previous investigations. The results of this study offer ontology engineers valuable criteria with which to evaluate ontology modules and help ontology users select qualifying ontology modules.

Ontology Module Metrics

In response to an increased need, various methods for ontology modularization have been proposed. However, few studies have focused on evaluative methods for ontology modules. In this study, we devise novel metrics to measure ontology modularity. To evaluate the ontology modules, we introduce cohesion and coupling based on the theory of software metrics. A cohesion metric and two coupling metrics were used to measure cohesion and coupling for ontology modules. These metrics were also designed to check consistency between the ontology modules and the original ontology. The new metrics support a more detailed relationship between classes in ontology modules. We validate the proposed metrics using the well known verification framework and the empirical experiments to complement previous investigations. This study offers ontology engineers valuable criteria with which to evaluate ontology modules and helps ontology users select the qualifying ontology modules.

Predictive value of video-sharing behavior: sharing of movie trailers and box-office revenue

Purpose The purpose of this paper is to examine whether the sharing of movie trailers on video-sharing social media has an impact on box-office revenue. Design/methodology/approach From December 2013 to November 2014, view statistics were collected for movie trailers from YouTube and matched with the box-office revenue of the relevant movies from Box Office Mojo. Based on the 72 sample movies, a panel simultaneous equation model was applied. Findings The results show that sharing of a movie trailer has a positive impact on the box-office revenue of the movie, and this effect is greater in the early stage of a movie release than in the later stage. Research limitations/implications This study analyzes, from electronic word-of-mouth (eWOM) and social influence perspectives, the effects of video-sharing activities on social media and their impact on sales with an example that is representative of entertainment goods or movie trailers. Practical implications This study reveals that promotion through video-sharing social media websites can serve as an essential marketing tool for entertainment goods such as movies, while the sharing of a movie trailer has a positive influence on the box-office revenue of the movie. Originality/value Focusing on the sharing features of video-sharing social media websites, this study contributes to enhancing our understanding of the predictive power of consumers’ video-sharing and expanding current research on eWOM and social influence.

Evolution of Virtual Communities

As the capabilities of technologies are enhanced and users become diversified, virtual communities have evolved from BBS to a new phenomena—virtual world. This study describes the evolution of VCs in three generations by three dimensions. Facing new challenges in new VC generation, VC platform providers need to adopt new approaches. The authors discuss important factors of future VCs. The field for VCs in the future will become more sophisticated and competitive.

Viewer Engagement in Movie Trailers and Box Office Revenue

As video consumption on social media becomes a major part of consumer activities, film marketers recognize that movie trailers on video-sharing social media can play an important role in raising potential audiences attention and interest. Focusing on consumer engagement in movie trailers and subsequent activities of sharing trailers by consumers, we examine the impact of movie trailers on box office revenue. From December, 2013 to August, 2014, investigating view statistics of movie trailers on YouTube and data of box office revenue from Boxofficemojo.com, We find out that consumer engagement in a movie trailer is positively related with their activities of sharing the movie trailer, thereby influencing box office revenue of the movie.

Understanding the Adoption of Telecommunications-Broadcasting Convergence Services: Focusing on t-Commerce

We derived an acceptance model on t-commerce that receives attention as a profit model in the future telecommunication-broadcasting convergence market. In addition, we extracted utilitarian value and hedonic value based on the motivation theory and considered interactivity reflecting on the characteristics of t-commerce and innovativeness indicating an individuals propensity for accepting a new

Evaluating ontology modularization approaches

Various techniques and methods for ontology modularization have recently been proposed. However, most research on ontology modularization has focused on the modularization technique itself, not on the modularization evaluation. In this research, a novel evaluation framework for ontology modularization is devised. The new framework is designed to measure not only the quality of ontology modules but also the modularization tools. To measure the quality of ontology modules, we introduce module size, module cohesion, and module coupling metrics derived from the theory of software engineering. Moreover, qualitative evaluation for ontology modularization tools is included in the proposed framework. Empirical experiments are performed, and the experimental results indicate that the proposed evaluation framework for ontology modularization is valid and effective. The purpose of the framework is to guide users in selecting an adequate ontology modularization approach.

ALTools Case Study: How ESTsoft Lays Golden Eggs

ALTools is a suite of utility software offered by ESTsoft, a Korean software company. ALTools includes eight programs: ALZip (compression and archiving utility), ALSee (image viewer and editor), ALFTP (FTP client and server), ALSong (music player with lyrics), ALShow (media player), ALToolbar (toolbar for Internet Explorer), ALPass (password manager for websites) and ALYac (antivirus). As of 2010, according to KoreanClick market research, over 20 million people were using ALTools in Korea and many of the ALTools programs were ranked first in their respective product categories.ALZip, the first ALTools application, was initially created for internal use, for an employee at the ESTsoft company who did not know how to use an English file archiver program. But after it generated significant public interest, ESTsoft decided to expand the “AL” series product line, releasing ALFTP in July 2000, ALSee in August 2000, ALPass in October 2002, ALShow in July 2004, ALSong in November 2004, ALToolbar in May 2007, and ALYac in December 2007. To manage the expansion of its product line, the company packaged them into one software suite, named ALTools in 2002 and developed an additional program that could assist users in keeping the AL series software titles up to date. It also commercialized ALTools in 2002, adding banner ads in ALTools products and selling software licenses to public institutions and private companies. However, they offered ALTools for free to individual users.ESTsoft is now looking for new business opportunities in the global market for ALTools. In February 2010, ESTsoft established ESTsoft, Inc. in the United States and entered the U.S. market directly. This is its second overseas branch, following ESTsoft Japan (September 2007). Do you think ALTools will be able to continue its success in other countries, outside of Korea? What challenges might it face?

A method to extract a social network based on semantic association

Much interest is currently focused on social network services such as Facebook and Twitter. Social media and social network change the method of human communication and will eventually change business methods as well. Research on social network has been used in various fields including management and applied science. However, studies on the semantic association in the network are rare. Semantic associations between entities are necessary for future business and social studies. In this research, the ontology-based social network analysis is performed. A new method to compute the strength of association among entities is proposed. Using the proposed method, a new social network is extracted. To evaluate the proposed method, experiments are performed. A group of university students are selected, and their social connections with other students are evaluated. The human responses are compared to the results of the extracted social network. The proposed method can be used to extract a social network from associations among entities in an ontology-based knowledge base.

A Case Study on Implementation and Optimization of Logistics Information System in Retail Industries

This work focuses on the implementation and optimization of the Automated Storage and Retrieval System(AS/RS) which is associated with Logistics Information System(LIS). We survey literature and present a case study for the optimization of Logistics System. In the case study, we examine the adaptation and implementation of AS/RS after we analyzed the processes of the company. Logistics Information System is an important component to keep up with the competitive advantage in the global business environments. The company in the case applies LIS to its efficient physical distribution management. AS/RS leads to some benefits; maximized storage space, increased productivity, reduced labor costs and human error, and improved accuracy. AS/RS is found especially effective when working with narrow aisles and extremely high racks.